Brocade FastIron Ethernet Switch Layer 3 Routing Configura Uživatelský manuál stáhnout pdf (Strana 42)

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broadcast support because any packet that is transmitted by one host is always received by the other

host at the receiving end. Therefore, directed broadcast on a point-to-point interface is eliminated.

IP-directed broadcast CLI configuration at the global level, or the per interface level, is not applicable

on interfaces configured with a 31-bit subnet mask IP address.

When the 31-bit subnet mask address is configured on a point-to-point link, using network addresses

for broadcast purposes is not allowed. For example, in an IPV4 broadcast scheme, the following

subnets can be configured:

• 10.10.10.1 - Subnet for directed broadcast: {Network-number , -1}

• 10.10.10.0 - Subnet for network address: {Network-number , 0}

In a point-to-point link with a 31-bit subnet mask, the previous two addresses are interpreted as host

addresses and packets are not rebroadcast.

Configuring an IPv4 address with a 31-bit subnet mask

To configure an IPv4 address with a 31-bit subnet mask, enter the following commands.

You can configure an IPv4 address with a 31-bit subnet mask on any interface (for example, Ethernet,

loopback, VE, or tunnel interfaces).

device(config)# interface ethernet 1/1/5

device(config-if-e1000-1/5)# ip address 10.9.9.9 255.255.255.254

You can also enter the IP address and mask in the Classless Inter-domain Routing (CIDR) format, as

follows.

device(config-if-e1000-1/1/5)# ip address 10.9.9.9/31

Syntax: [no] ip address ip-address ip-mask

Syntax: [no] ip address ip-address/subnet-mask-bits

The ip-address variable specifies the host address. The ip-mask variable specifies the IP network

mask. The subnet -mask-bits variable specifies the network prefix mask.

To disable configuration for an IPv4 address with a 31-bit subnet mask on any interface, use the no

form of the command.

You cannot configure a secondary IPv4 address with a 31-bit subnet mask on any interface. The

following error message is displayed when a secondary IPv4 address with a 31-bit subnet mask is

configured.

Error: Cannot assign /31 subnet address as secondary

Configuration example

FIGURE 2 Configured 31- bit and 24-bit subnet masks

Router A is connected to Router B as a point-to-point link with 10.1.1.0/31 subnet. There are only two

available addresses in this subnet, 10.1.1.0 on Router A and 10.1.1.1 on Router B,

Configuring an IPv4 address with a 31-bit subnet mask

42 FastIron Ethernet Switch Layer 3 Routing Configuration Guide

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